Developer Lab · Text tools
Text Diff Checker
Compare two text versions and see additions, deletions, and unchanged lines.
Limit: 32,000 characters and 300 lines per side. The comparison runs entirely in your browser.
Paste text on either side, then select Compare.
Line changes
+ added · − removed · space unchanged. Line order is preserved.
How the comparison works
Compares lines using a longest-common-subsequence algorithm. A changed line may appear as one removal and one addition. The result is text-only, and nothing is uploaded.